How	  Fiber	  Op,cs	  Work
What	  are	  Fiber	  Op,cs?	Parts:	  •  Core	  •  Cladding	  •  Buffer	  coa,ng	  types:	  •  Single-­‐mode	  fibers	  •  Mu...
How	  Does	  an	  Op,cal	  Fiber	                   Transmit	  Light?	•  total	  internal	  reflec,on	  •  degrades	  	  • ...
A	  Fiber-­‐Op,c	  Relay	  System	•  TransmiLer	  	  	  	  	  	  -­‐	  Produces	  and	  encodes	  the	  light	  signals	  ...
Advantage	  of	  Fiber	  Op,cs	•    Less	  expensive	  •    Thinner	  •    Higher	  carrying	  capacity	  •    Less	  sign...
How	  Are	  Op,cal	  Fibers	  Made?	1.	  Making	  a	  preform	  glass	  cylinder	  2.	  Drawing	  the	  fibers	  from	  the...
1.	  Making	  a	  preform	  glass	  cylinder	  	  	  	  	  The	  glass	  for	  the	                  preform	  is	  made	 ...
2.	  Drawing	  Fibers	    from	  the	  Preform	             Blank	  		  	  	  	  	  	  Once	  the	  preform	              ...
3.	  Tes,ng	  the	  fibers	•    Tensile	  strength	  •    Refrac,ve	  index	  profile	  •    Photo	  courtesy	  Corning	  • ...
Physics	  of	  Total	  Internal	  Reflec,on		  	  	  	  We	  will	  explain	  about	                  internal	  reflec,on	 ...
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How fiber optics work

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How fiber optics work

  1. 1. How  Fiber  Op,cs  Work
  2. 2. What  are  Fiber  Op,cs? Parts:  •  Core  •  Cladding  •  Buffer  coa,ng  types:  •  Single-­‐mode  fibers  •  Mul,-­‐mode  fibers  
  3. 3. How  Does  an  Op,cal  Fiber   Transmit  Light? •  total  internal  reflec,on  •  degrades    •  Diagram  of  total   internal  reflec,on  in  an   op,cal  fiber
  4. 4. A  Fiber-­‐Op,c  Relay  System •  TransmiLer            -­‐  Produces  and  encodes  the  light  signals  •  Op,cal  fiber            -­‐  Conducts  the  light  signals  over  a  distance  •  Op,cal  regenerator              -­‐  May  be  necessary  to  boost  the  light  signal  (for  long   distances)  •  Op,cal  receiver            -­‐  Receives  and  decodes  the  light  signals  
  5. 5. Advantage  of  Fiber  Op,cs •  Less  expensive  •  Thinner  •  Higher  carrying  capacity  •  Less  signal  degrada,on  •  Light  signals  •  Low  power  •  Digital  signals  •  Non-­‐flammable  •  Lightweight  
  6. 6. How  Are  Op,cal  Fibers  Made? 1.  Making  a  preform  glass  cylinder  2.  Drawing  the  fibers  from  the  preform  3.  Tes,ng  the  fibers
  7. 7. 1.  Making  a  preform  glass  cylinder          The  glass  for  the   preform  is  made  by  a   process  called  modified   chemical  vapor   deposi,on  (MCVD).
  8. 8. 2.  Drawing  Fibers   from  the  Preform   Blank              Once  the  preform   blank  has  been  tested,   it  gets  loaded  into  a   fiber  drawing  tower.
  9. 9. 3.  Tes,ng  the  fibers •  Tensile  strength  •  Refrac,ve  index  profile  •  Photo  courtesy  Corning  •  Finished  spool  of  op,cal  fiber  •  Fiber  geometry  •  ALenua,on    •  Informa,on  carrying  capacity  (bandwidth)  •  Chroma,c  dispersion  •  Opera,ng  temperature/humidity  range  •  Temperature  dependence  of  aLenua,on  •  Ability  to  conduct  light  underwater
  10. 10. Physics  of  Total  Internal  Reflec,on        We  will  explain  about   internal  reflec,on  in  an   op,cal  fiber  In  physics.  

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